CB_GETLBTEXTLEN message

Gets the length, in characters, of a string in the list of a combo box.

Parameters

wParam

The zero-based index of the string.

lParam

This parameter is not used.

Return value

The return value is the length of the string, in TCHARs, excluding the terminating null character. If an ANSI string this is the number of bytes, and if it is a Unicode string this is the number of characters. Under certain conditions, this value may actually be greater than the length of the text. For more information, see the Remarks section.

If the wParam parameter does not specify a valid index, the return value is CB_ERR.

Remarks

Under certain conditions, the return value is larger than the actual length of the text. This occurs with certain mixtures of ANSI and Unicode, and is due to the operating system allowing for the possible existence of double-byte character set (DBCS) characters within the text. The return value, however, will always be at least as large as the actual length of the text; so you can always use it to guide buffer allocation. This behavior can occur when an application uses both ANSI functions and common dialogs, which use Unicode.

To obtain the exact length of the text, use the WM_GETTEXT, LB_GETTEXT, or CB_GETLBTEXT messages, or the GetWindowText function.

Requirements

See also

Reference

CB_GETLBTEXT

LB_GETTEXT

Other Resources

GetWindowText

WM_GETTEXT